| 1 | /*
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| 2 | * Copyright (C) 1996-2001 Internet Software Consortium.
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| 3 | *
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| 4 | * Permission to use, copy, modify, and distribute this software for any
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| 5 | * purpose with or without fee is hereby granted, provided that the above
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| 6 | * copyright notice and this permission notice appear in all copies.
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| 7 | *
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| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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| 9 | * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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| 10 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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| 11 | * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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| 12 | * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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| 13 | * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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| 14 | * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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| 15 | * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | #include "replace.h"
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| 20 | #include "system/network.h"
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| 21 |
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| 22 | #define NS_INT16SZ 2
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| 23 | #define NS_IN6ADDRSZ 16
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| 24 |
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| 25 | /*
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| 26 | * WARNING: Don't even consider trying to compile this on a system where
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| 27 | * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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| 28 | */
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| 29 |
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| 30 | static const char *inet_ntop4(const unsigned char *src, char *dst,
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| 31 | socklen_t size);
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| 32 |
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| 33 | #ifdef AF_INET6
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| 34 | static const char *inet_ntop6(const unsigned char *src, char *dst,
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| 35 | socklen_t size);
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| 36 | #endif
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| 37 |
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| 38 | /* char *
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| 39 | * isc_net_ntop(af, src, dst, size)
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| 40 | * convert a network format address to presentation format.
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| 41 | * return:
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| 42 | * pointer to presentation format address (`dst'), or NULL (see errno).
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| 43 | * author:
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| 44 | * Paul Vixie, 1996.
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| 45 | */
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| 46 | const char *
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| 47 | rep_inet_ntop(int af, const void *src, char *dst, socklen_t size)
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| 48 | {
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| 49 | switch (af) {
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| 50 | case AF_INET:
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| 51 | return (inet_ntop4(src, dst, size));
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| 52 | #ifdef AF_INET6
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| 53 | case AF_INET6:
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| 54 | return (inet_ntop6(src, dst, size));
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| 55 | #endif
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| 56 | default:
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| 57 | errno = EAFNOSUPPORT;
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| 58 | return (NULL);
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| 59 | }
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| 60 | /* NOTREACHED */
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| 61 | }
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| 62 |
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| 63 | /* const char *
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| 64 | * inet_ntop4(src, dst, size)
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| 65 | * format an IPv4 address
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| 66 | * return:
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| 67 | * `dst' (as a const)
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| 68 | * notes:
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| 69 | * (1) uses no statics
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| 70 | * (2) takes a unsigned char* not an in_addr as input
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| 71 | * author:
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| 72 | * Paul Vixie, 1996.
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| 73 | */
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| 74 | static const char *
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| 75 | inet_ntop4(const unsigned char *src, char *dst, socklen_t size)
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| 76 | {
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| 77 | static const char *fmt = "%u.%u.%u.%u";
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| 78 | char tmp[sizeof "255.255.255.255"];
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| 79 | size_t len;
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| 80 |
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| 81 | len = snprintf(tmp, sizeof tmp, fmt, src[0], src[1], src[2], src[3]);
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| 82 | if (len >= size) {
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| 83 | errno = ENOSPC;
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| 84 | return (NULL);
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| 85 | }
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| 86 | memcpy(dst, tmp, len + 1);
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| 87 |
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| 88 | return (dst);
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| 89 | }
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| 90 |
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| 91 | /* const char *
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| 92 | * isc_inet_ntop6(src, dst, size)
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| 93 | * convert IPv6 binary address into presentation (printable) format
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| 94 | * author:
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| 95 | * Paul Vixie, 1996.
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| 96 | */
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| 97 | #ifdef AF_INET6
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| 98 | static const char *
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| 99 | inet_ntop6(const unsigned char *src, char *dst, socklen_t size)
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| 100 | {
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| 101 | /*
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| 102 | * Note that int32_t and int16_t need only be "at least" large enough
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| 103 | * to contain a value of the specified size. On some systems, like
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| 104 | * Crays, there is no such thing as an integer variable with 16 bits.
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| 105 | * Keep this in mind if you think this function should have been coded
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| 106 | * to use pointer overlays. All the world's not a VAX.
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| 107 | */
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| 108 | char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
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| 109 | struct { int base, len; } best, cur;
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| 110 | unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ];
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| 111 | int i, inc;
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| 112 |
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| 113 | /*
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| 114 | * Preprocess:
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| 115 | * Copy the input (bytewise) array into a wordwise array.
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| 116 | * Find the longest run of 0x00's in src[] for :: shorthanding.
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| 117 | */
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| 118 | memset(words, '\0', sizeof words);
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| 119 | for (i = 0; i < NS_IN6ADDRSZ; i++)
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| 120 | words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
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| 121 | best.base = -1;
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| 122 | best.len = 0;
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| 123 | cur.base = -1;
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| 124 | cur.len = 0;
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| 125 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
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| 126 | if (words[i] == 0) {
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| 127 | if (cur.base == -1)
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| 128 | cur.base = i, cur.len = 1;
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| 129 | else
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| 130 | cur.len++;
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| 131 | } else {
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| 132 | if (cur.base != -1) {
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| 133 | if (best.base == -1 || cur.len > best.len)
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| 134 | best = cur;
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| 135 | cur.base = -1;
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| 136 | }
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| 137 | }
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| 138 | }
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| 139 | if (cur.base != -1) {
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| 140 | if (best.base == -1 || cur.len > best.len)
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| 141 | best = cur;
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| 142 | }
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| 143 | if (best.base != -1 && best.len < 2)
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| 144 | best.base = -1;
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| 145 |
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| 146 | /*
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| 147 | * Format the result.
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| 148 | */
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| 149 | tp = tmp;
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| 150 | for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
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| 151 | /* Are we inside the best run of 0x00's? */
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| 152 | if (best.base != -1 && i >= best.base &&
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| 153 | i < (best.base + best.len)) {
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| 154 | if (i == best.base)
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| 155 | *tp++ = ':';
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| 156 | continue;
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| 157 | }
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| 158 | /* Are we following an initial run of 0x00s or any real hex? */
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| 159 | if (i != 0)
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| 160 | *tp++ = ':';
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| 161 | /* Is this address an encapsulated IPv4? */
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| 162 | if (i == 6 && best.base == 0 &&
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| 163 | (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
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| 164 | if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
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| 165 | return (NULL);
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| 166 | tp += strlen(tp);
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| 167 | break;
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| 168 | }
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| 169 | inc = snprintf(tp, 5, "%x", words[i]);
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| 170 | if (inc >= 5) {
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| 171 | abort();
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| 172 | }
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| 173 | tp += inc;
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| 174 | }
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| 175 | /* Was it a trailing run of 0x00's? */
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| 176 | if (best.base != -1 && (best.base + best.len) ==
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| 177 | (NS_IN6ADDRSZ / NS_INT16SZ))
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| 178 | *tp++ = ':';
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| 179 | *tp++ = '\0';
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| 180 |
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| 181 | /*
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| 182 | * Check for overflow, copy, and we're done.
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| 183 | */
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| 184 | if ((size_t)(tp - tmp) > size) {
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| 185 | errno = ENOSPC;
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| 186 | return (NULL);
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| 187 | }
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| 188 | memcpy(dst, tmp, tp - tmp);
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| 189 | return (dst);
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| 190 | }
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| 191 | #endif /* AF_INET6 */
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